The K1000 Appliance running FreeBSD Operating System's TCP/IP protocol header connections transitioning to the LAST_ACK state can become permanently stuck due to mishandling of protocol state in certain situations, which in turn can lead to accumulated consumption and eventual exhaustion of system resources, such as mbufs and sockets. The mbuf cluster size is only 2K and the Jumbo cluster size can be equal to a CPU page size mainly used in local networks with Ethernet frames lager than usual 15000 bytes. the mbuf clusters are used for both sending and receiving and the jumbo cluster is mainly used for sending only.
